Using custom Bootstrap and Font Awesome files

Theme

A theme can force the core to use a customized build of Bootstrap CSS file by setting the bootstrapPath parameter value in its theme.yaml file:

bootstrapPath: '@AcmeFooThemeBundle:css/bootstrap.min.css'

Full site

A site administrator can force the core to use a customized assets setting parameter values Modify these values in the /config/packages/zikula_theme.yaml file (create the file if needed):

zikula_theme:
    bootstrap:
        css_path: '/bootstrap/css/bootstrap.min.css'
        js_path: '/bootstrap/js/bootstrap.bundle.min.js'
    font_awesome_path: '/font-awesome/css/all.min.css'

Note these resolve to public/ subfolders (see Locations of Templates and Assets).

Instead of putting it into an extension you can also have it inside public directly:

zikula_theme:
    bootstrap:
        css_path: /custom-bootstrap.min.css

Warning: setting these values will affect every theme on the site.